Head in the Cloud

I am experimenting with Cloud storage, programs that will sync to my computer, save and update files so that I can access them from any computer, and have any changes I make reflected when I access the same file at home. So far I've examined Moby Stash, Google Drive, and Microsoft SkyDrive (I'm a Windows user.) It would seem that all of them require me to create a file structure in the cloud and then put the files I want into that file structure. Is there one where I can just mark files in any place on my home computer and have the cloud space recognize/collect them and record the changes?  I feel odd about basically tucking all the files I might want to change on my (new) travel computer in a single folder.